Is buying from ebay an option? If not you could try buying from amazon japan and having it shipped to Holland using a courier service like Tenso. I think it'll come out to be ~$160 for the A900X plus $35 for shipping.

In this case, you may want to go the lightest you can find. The headphone's weight is usually the biggest contributor to any sort of fatigue you feel at the top of your head. The Sony MA900 is extremely light and is very comfortable despite having the general run-of-the-mill headband design. It's also extremely good for games and is actually one of my favorite sounding headphones, and one of the most comfortable I've tried.

I also own the AD700 and the color isn't as big of a deal as you might think. If so, you could always spray paint it a new color like I've seen many users do before (I believe one user has a picture tutorial on his "Dark Knight" mod that turned his all black). The AD700 is probably one of the best choices for competitive and casual gaming due to it's excellent positional capabilities and large soundstage. Doesn't do incredibly well for music though. It's also extremely comfortable for longer sessions.

There are courier companies that specialize in shipping japanese products to foreign countries. You make an account with the company and order what you want on amazon japan. You then enter the shipping company's address (based in japan) as the shipping address along with your account number. Once the shipping company receives your package they'll forward it to you. This guide should show you how the process works:

I have had this problem with quite a few headphones (the headband pressing down against the top part of my head), especially K701 and M50, but I haven't had this problem with the K550. I can see how it can be uncomfortable by looking at its shape, but thing with the K550 is that they're light enough for it to be not too bothersome for me.

K550's headband is made of metal, however, so you may want to experiment with bending the headband a little so that they distribute more evenly over the top of your head and not just the topmost part.